Government and sports officials reacted with outrage Monday after the opening weekend of the Italian football season was marred by Napoli fans rioting on a train to Rome.

A group of several hundred Napoli supporters launched firecrackers, broke windows, slashed seats open and caused $730,000 worth of damage to the train Sunday, Italian media reported. Rome's transport agency said some of its buses were also vandalized, causing $88,000 in damage.

At least four railway workers were injured, reports said, and more violence erupted when the train reached Rome for the AS Roma-Napoli game, which ended 1-1. Rome police reported five arrests near the stadium.

Italian football federation president Giancarlo Abete called for serious measures "against these delinquents who ruin the image of football on a national and international level. ... Football is not represented by these people."

Napoli fans may be barred from away games for the rest of the season.